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Natsu's adorable, Shoyo thinks.
Looks at her sleeping body like she's Aurora, snuggling so comfortably in her bed that holds her miniature frame. Guesses it begins with a kiss, so he leans in and presses a kiss to his baby sister's lips. So sweet, and he can faintly taste the prison food he'll eat if anybody finds out about this.
As much as he would like to admire her, he knows he can't waste time, so he slips his cock from his shorts and rubs it between her thighs, rocking his hips while forcing himself not to make noises. A soft smile curls at his lips, brushing her messy ginger hair out of her face to adorn her truly. Natsu is like temptation, and he can't help but feel like Prince Philip protecting a sweet angel.
Oh- who is he kidding? He's totally desecrating her.
Shoyo tries to be a good brother, he really does, even as he's fucking her thighs. Precum smears across the plush flesh, causing him to groan lightly at the sight. He bites down on his lip, reaching his hands out to fondle her prepubescent chest. To think she'll start developing tits soon is a treacherous thought, so he swallows his guilt—
He drowns in it.
Natsu snores lightly, not even stirring as the minutes pass. That doesn't make Shoyo any less anxious, but he bucks his hips forward more steadier, taking advantage of the opportunity presented to him from his little sister. She's just a child, he knows he shouldn't do this, but it's better if she never knows what happens whenever she's asleep, and Shoyo is feeling particularly passionate, desperate enough to fuck his own kid sister.
It's not too bad if he doesn't stick his dick in, right? The thought is flustering, throat drying at the idea of going that far. Still, Shoyo feels the need to see her pussy, and he slips her underwear to the side, reveling in her already wet cunt. She'll never know.
Now, Shoyo knows this is still fucked even if he doesn't feel her tight, spongy walls squeezing around his dick, but it's not actual rape if he doesn't force it instead, right? It's different, and he wastes no time in pressing his cock over her baby folds, sliding between them without actually sinking within her. "Ah..."
"Shush," Shoyo kisses her lightly, squeezing her chest still while getting off on her pussy lips, hoping the precum doesn't alarm her. He feels his balls tighten, but it's okay, because he can finish in his hand when he sneaks back to his room. Her cunny is dripping, and he holds back, pace faltering as he rolls his hips.
"Fuck, fuck..." He mutters. He won't last.
"Love you, Natsu." He kisses her forehead before leaving.